My X17 came with a small useless Lowrance X47 installed flush in the carpeted box next to the console. This box is a cut, formed, and welded piece of aluminum attached to the cap by screws. I detached the box, removed the X47, peeled back the carpet, cut a bigger hole to fit the Lowrance 640C, re glued the carpet, and installed the new unit. I had to upgrade to the new transducer so I threaded the new wire using the old wire. The old transducer brackets on the transom fit perfectly. 2 people, 3 hours and it looks factory installed. My GPS antennae is installed where my useless cup holder used to be. directly behind the head unit in the aluminum box. Jim
2005 Xpress X17
90hp Evinrude Etec